For nearly the entire history of film production, certain films have been banned by film censorship or review organizations for political or moral reasons or for controversial content, such as racism, copyright violation, and underage immorality. Censorship standards vary widely by country, and can vary within an individual country over time due to political or moral change.
Many countries have government-appointed or private commissions to censor and rate productions for film and television exhibition. While it is common for films to be edited to fall into certain rating classifications, this list includes only films that have been explicitly prohibited from public screening. In some countries, films are banned on a wide scale; these are not listed in this table.
Generally speaking, the government itself cannot ban a film, since the United States Supreme Court ruled that films are protected by the First Amendment to the United States Constitution in a landmark 1950s decision. Instead of formal government censorship or bans, the film industry has, largely, policed itself through content-based ratings that are awarded to the vast majority of films that are to be publicly exhibited. Sometimes, a filmmaker may make edits to a film to avoid an 'R-rating' or an 'NC-17' rating, but a modern-day, government ban on a film would likely be struck down by the courts.